I constructed the 2nd root rib today - seen in the jig before gluing. The problem with this type of jig is that the jig blocks can not be glued to the board as there is a piece of plastic sheet protecting the plan from the glue. This means that when fixing and removing the ribs the nails holding the jig blocks can tend to loosen allowing them to move. OK for two-off root ribs but not for 24 identical main ribs.
